Imagine meeting the love of your life, entering a relationship with them, and then belatedly realizing your literal body rejects the union. It sounds like some kind of sick cosmic joke, but anecdotal evidence suggests it could be a reality for some. In recent months, a number of personal stories about women speculating they are essentially “allergic” to their boyfriends or husbands—their words, not ours—have cropped up on social media, fascinating and horrifying in equal measure.
Classically, this sort of interpersonal “allergy” comes to light through recurrent UTIs after sex. But that’s not always the case: In one of the more high-profile examples, ice skater Alex Murphy Klein found out she was “immunologically incompatible” with her husband Paul’s DNA after the couple had a hard time conceiving. The headline of the resulting People magazine article: “Woman Learns She’s ‘Allergic’ to Her Husband After Years of Trying to Get Pregnant.”
Hence the fundamental question posed in the headline of this story: Can you actually be allergic to another person? If so, does that allergy work the same as a food or pollen allergy, or does it represent a different biological pathway entirely? And finally, is it something you can treat, just as you might pop a Zyrtec if you have hay fever? Read on for all the answers—and to find out what to do if you ever run into this issue firsthand. (Spoiler alert: Don’t worry—it’s not exactly common.)
Can you actually be allergic to another person?
When we did a little digging to investigate the extent of this phenomenon, we discovered a trove of Reddit posts from desperate people who suspect their romantic partner is the root cause of their puffy eyes or hive-riddled skin. “My boyfriend is long distance from the UK. Whenever he visits me (or I visit him) my skin gets really dry and I get acne,” one user wrote in the subreddit r/DermatologyQuestions. “The first time she stayed over she woke up with an allergic reaction. Puffy/swollen irritated eyes and hives on her neck and chest,” another user recounted in the subreddit r/Allergies. “I (21f) used to have eczema when i was a kid up until i was around 11. I haven’t had any crazy flare ups until 5 weeks ago, when symptoms started showing up about a week after I started seeing someone new,” yet another user told r/eczema. In case you were wondering, the alleged trigger doesn’t always have to be a romantic partner, either: Tutors, friends, and strangers have all been implicated as well. But since a handful of social media posts isn’t exactly rigorous scientific proof, we also reached out to a couple MDs for their thoughts on this phenomenon.
“Yes, you can be ‘allergic’ to another person,” Nana Mireku, MD, a board-certified allergy specialist based in Texas and a fellow of both the American Academy of Allergy, Asthma, and Immunology (FAAAAI) and the American College of Allergy, Asthma and Immunology (FACAAI), tells SELF. To be clear, true interpersonal allergies are rare—many alleged cases probably involve some sort of environmental allergy (like an allergy to a specific personal hygiene product the person uses) rather than an allergy to the person themself—but they can and do occur.
What does an allergy to another person look like?
Several different mechanisms and conditions can be behind interpersonal allergies. Of these, one of the most intriguing is a syndrome known as “People Allergic to Me” (PATM), which refers to individuals whose skin gases supposedly provoke “allergy-like reactions” (think sneezing, coughing, eye redness, and runny nose) in others. Thus far, at least one published study has lent some credence to the idea: Japanese researchers analyzing skin gas profiles found that self-identified PATM patients exhibited a “significant difference” from non-PATM patients. Specifically, the study found the PATM patients emitted more petrochemicals, organosulfur compounds, and some aldehydes (including 39 times the normal amount of toluene, a chemical found in crude oil), among other distinctions—findings published in the scholarly journal Scientific Reports in 2023. While there hasn’t been much research on PATM thus far, cases have been reported in a number of countries, and the condition is slowly but surely amassing recognition within the medical community.
@talia.hannosh sometimes your body really does reject a man lmao
Other than PATM, an allergy to another person (a biological male, in this case) can also manifest as an allergy to their semen. To be specific, it’s “the protein in the seminal fluid,” Arielle Bayer, MD, a double board-certified reproductive endocrinologist and infertility specialist at CCRM Fertility of New York, tells SELF. Known in the medical field as human seminal plasma hypersensitivity, this condition “involves the same mechanism that occurs with seasonal allergies or food allergies, such as peanuts or tree nuts,” Dr. Mireku says: It’s mediated by immunoglobulin E (IgE), an antibody that is produced in response to an immune system overreaction and triggers those classic allergy signs. Semen allergies are also reported on Reddit in subs like r/WomensHealth, r/Healthyhooha, r/TheGirlSurvivalGuide, r/TryingForABaby, and even r/AskMen: “It’s a burning irritation that makes it so that I can barely sit still,” one distressed college student wrote last year.
Women with a semen allergy “typically exhibit local symptoms such as vaginal burning, itching, and swelling,” Dr. Mireku says, but they “can also develop generalized systemic symptoms like hives, swelling, coughing, [and] wheezing,” all the way up to life-threatening anaphylaxis. Not all sperm contains the same proteins, so this issue could potentially occur with one partner but not others, according to Dr. Bayer. While she doesn’t encounter many semen allergy cases specifically, she notes that “we see a lot” of unexplained infertility cases involving women who have similar hypersensitivity reactions.
On that note, the exact prevalence of semen allergy among the population isn’t known (some estimates put the number of afflicted women in the US at around 40,000), but the condition is typically considered rare, according to Dr. Mireku. That said, Dr. Mireku notes, experts “think that this condition is also significantly underreported due to the intimate nature.” For many people, the prospect of telling their doctor they break out in welts after coming into contact with semen is obviously pretty daunting. (Incidentally, some men are even allergic to their own semen, a separate condition known as “post-orgasmic illness syndrome.”)
On the flip side, evidence suggests that some men may be allergic to cervicovaginal fluid, though research on the topic is even more scarce. In a 2018 study published in the Journal of the European Academy of Dermatology and Venereology, researchers identified 52 suspected cases of cervicovaginal fluid hypersensitivity and concluded that it is “at least” as common as semen allergy—the first time the condition had ever been reported in medical literature.
How can an allergy to another person affect your relationship with them?
Not well, at the risk of stating the obvious. People with PATM often feel deeply isolated and depressed as a result of the perceived discrimination they face from others, according to the 2023 study. Meanwhile, people with a semen allergy may struggle to connect physically with their partners due to the pain and discomfort they experience as a result of sexual intercourse, which can take a corresponding toll on the emotional bond.
@fertilitydrnagla Can you actually be allergic to your partner’s sperm? 👀 It sounds wild, but yes sperm allergy is a real medical condition (though thankfully very rare). Most of the time, what people think is a “sperm allergy” is actually irritation, infection, or something else entirely… but for a very small number of people, the immune system really does react to proteins in semen. Typical signs include: • Burning or itching after ejaculation • Redness or swelling • Symptoms that only happen after contact with semen • And symptoms improving with condoms BUT here’s the key thing 👇 If you’re trying to conceive and it’s not happening, an allergy to semen is very unlikely to be the cause. If you’re experiencing discomfort after sex, speak to your doctor — it might be something else entirely (like infections, skin conditions, or pelvic floor issues), and all of those are far more common. #TTCcommunity #fertilityeducation #fertilitydoctor #fertilityawareness #TryingToConceive ♬ original sound - Dr Nagla | OBGYN
Beyond the immediate allergic reaction, however, a semen allergy can also interfere with conception (and, in fact, is probably the “immunological incompatibility” Murphy Klein was referring to in the People magazine article, according to Dr. Bayer, though she emphasizes that she’s not Murphy Klein’s doctor and doesn’t know her exact medical history). In a similar case reported in the journal Frontiers in Medicine in 2024, a 29-year-old Lithuanian woman was diagnosed after failing to conceive for four years. While “the actual IgE-mediated response isn't killing sperm or preventing sperm from its normal activity, it can make the act of conception, like intercourse, really uncomfortable and difficult,” Dr. Bayer explains.
In other words, a semen allergy isn’t a direct cause of infertility, but it can indirectly contribute. And regardless of the source, both painful sex and fertility challenges “can put tremendous strain on a relationship,” Dr Bayer says. Alex Murphy Klein’s husband, Paul, told ITV’s “This Morning” their ordeal made him feel “helpless” at times. Regarding cervicovaginal fluid allergy, the authors of the 2018 paper don’t seem to speculate about the broader life consequences, but it’s not too much of a stretch to assume it could carry similar risks.
For what it’s worth, a 2014 article published in the journal Evolutionary Psychology hypothesizes that a semen allergy signifies a genetic incompatibility between two individuals and thus works to discourage mating and reproduction. In the 2018 paper, the authors reference this theory and speculate that a cervicovaginal fluid allergy serves the same purpose. Even Redditors sometimes come to a similar conclusion on their own. “Maybe you just don’t jive,” one commenter wrote in response to a recurrent-UTI query.
What can you do about it?
When it comes to PATM, not much. Effective treatment isn’t often an option because the condition is so hard to pin down in the first place, according to a 2019 study published in the Asian Journal of Psychiatry.
Semen allergy, on the other hand, is a little easier and more straightforward to address, at least in the short term. “Condoms are the initial course of treatment for this allergy to prevent symptoms,” Dr. Mireku says. In fact, wrapping it up is the “gold standard” for ruling out confounding factors, according to Dr. Bayer: “If you're not experiencing any of those symptoms with use of a condom, then it could be due to the partner’s semen specifically,” she explains.
If you’re trying for a baby, however, semen is kind of a nonnegotiable, so couples will have to develop workarounds. “For those desiring to start a family, other options include care under a specialized allergist to confirm the seminal allergy and proceed with desensitization procedures”—like injecting the patient with small amounts of their partner’s semen to help build up a tolerance—“to treat this allergy,” Dr. Mireku says. Taking an antihistamine medication before sex (hello, Benadryl!) may also be able to help, according to the Cleveland Clinic, though you should also keep an EpiPen on hand if you have a history of systemic symptoms. Both desensitization procedures and antihistamines are also likely effective against a cervicovaginal fluid allergy, according to the 2018 study. (In contrast, condoms aren’t likely to work for cervicovaginal fluid allergy, since they shield the penis but not the groin and scrotum.)
Other couples might turn to in vitro fertilization (IVF) or intrauterine insemination (IUI). Both procedures involve “sperm washing”—a process that removes the proteins from the semen, a.k.a. the exact components spurring the allergic reaction, according to Dr. Bayer. During this process, the sample is spun in a centrifuge to concentrate it, dispelling all the nonessential fluids “so that just the moving, living, active, mobile, motile sperm” are left, she explains. Murphy Klein told “This Morning” that she and her husband turned to IVF after a year of trying and failing to conceive naturally, but after the initial IVF round failed too, she had a hunch something deeper was to blame. Ultimately, blood testing bore out her suspicions.
What to take away from all this
If you’ve noticed a pattern of physical symptoms after meeting or dating someone new, don’t immediately assume you must be allergic to them in some way. Like we said, both PATM and semen allergy seem to be rare, so it’s statistically improbable either condition is the culprit. (By comparison, an allergy to something in the environment, like pet dander, dust mites, or a personal hygiene product, is far more likely). Besides, the typical symptoms of a semen allergy—vaginal burning, itching, irritation—can be caused by a range of factors (a UTI, yeast infection, or bacterial vaginosis, to name a few), so those are hardly reliable indicators, either. With so many potential confounders at play, “I think it's just so important to get evaluation and to seek out medical advice before jumping to the conclusion you have an allergy to your partner,” Dr. Bayer says.
If you do happen to be one of the unlucky few to have a bona fide semen allergy, try not to beat yourself up or freak out about the future of your relationship. “None of this is your fault,” Dr. Bayer emphasizes, cautioning against the fatalism trap. Still, it can be a daunting situation to navigate emotionally and financially, so making sure that you have mental health support (like a therapist or even a neutral third party such as a friend) as you navigate diagnosis and treatment “is incredibly important because no matter what the fertility struggle is, it definitely can take a toll on that relationship,” Dr. Bayer says. To reiterate, however, not all hope is lost for anyone living with this condition: “We have so many tools and protocols in place to help overcome these barriers, whether it's intrauterine insemination, fertility treatment, or certain medications that can help with the IgE immune response,” Dr. Bayer says.
And as for the recurrent UTIs posited in some social media posts to be a type of partner allergy? If all other potential causes are ruled out, sure, “it could be related to an immune response or a hypersensitivity response,” Dr. Bayer says. Ultimately, the medical establishment has a very rudimentary understanding of how this all works at this point in time (and, in fact, it’s the subject of an emerging medical field known as “reproductive immunology”), so a lot remains up in the air. Right now, “we don't have a lot of research in this area,” Dr. Bayer acknowledges, “but I hope that the field continues to push it and evolve and learn more.”
Original article appeared on SELF
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